Several entries will match the search filter. You probably need the entry using cn=Certification
Authorities, cn=Public Key Services in its DN.

Open a text editor and cut the first value of the first CA certificate
attribute (it should be a base64 encoded text block). Paste that value (text block) into
the text editor (only the value). Edit the contents, so that none of the lines
start with white space.

Add-----BEGIN CERTIFICATE----- before the first
line and -----END CERTIFICATE----- after the last line.
See the following example: